Source: http://www.abarim-publications.com/Meaning/Adoram.html

🔼The name Adoram in the Bible

Adoram is either an alternate name for Adoniram, or is a completely different man all together. Both are supervisors of slaves subjected to forced labor; Adoram serves king David (2 Samuel 20:24) and Adoniram serves king Solomon (1 Kings 4:6, 5:14). Hadoram, a third name, which is similar to the name Adoram, belongs to the slave supervisor of Solomon's son and successor, king Rehoboam (2 Chronicles 10:18).

🔼Etymology of the name Adoram

Most commentators regard the name Adoram as an improperly or erroneously contracted form of the name Adoniram, and render it therefore the same meaning: BDB Theological Dictionary and NOBSE Study Bible Name List both read My Lord Is Exalted; Jones' Dictionary of Old Testament Proper Names has Lord Of Height. But it's by no means certain, indicated or even implied that the two or three men are the same. And even if they are, these three names are obviously completely different words and therefore mean different things. It's not unusual for Biblical characters to have multiple names, and each name must be considered according to its own meaning.

A name that's closely similar to our name אדרם (Adoram) is the name of the city אדורים (Adoraim). It's not uncommon for people and cities to have the same name in the Bible. Look in the menu to the left under "Locations/Peoples" for names of locations that are also personal names (i.e. Ananiah or Tamar)

But the name Adoram looks like it would have reminded a Hebrew audience without ado of the verb אדר (adar), meaning to be majestic: